Halle, Jean C. published the artcileIonization of substituted nitroaromatic amines in aqueous dimethyl sulfoxide media. I. Poly(nitro)arylamines, Synthetic Route of 1821-27-8, the publication is Bulletin de la Societe Chimique de France (1973), 1225-30, database is CAplus.
The acidity constants (pKa) of 22 mono-, di-, and trinitroarylamines were determined in H2O-Me2SO. The pKa’s of mononitro amines decreased with increasing Me2SO content of the medium, but the pKa’s of dinitro and trinitro amines increased with increased Me2SO in the medium. These results indicate that the stabilizing influence of Me2SO on amide anions is greater as the charge is more delocalized.
Bulletin de la Societe Chimique de France published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Synthetic Route of 1821-27-8.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia